Compatibility with go1.11: Fix vendoring and function calls to dedis/kyber library

[gabbifish]

Fixes #70. Apologies for the large diff: this is due to my inclusion of the updated vendor directory, which includes the required version of dedis/kyber for go1.11 compatibility.

Some of the tests are failing because of timeouts that I can't pinpoint, and I'd love some help with this before thinking about a merge. The timeouts are also occurring in Travis, so you can check out the full stack trace there.

$ go test ./...
ok  	github.com/dedis/drand	1.387s
ok  	github.com/dedis/drand/beacon	(cached)
*** Test killed with quit: ran too long (10m0s).
FAIL	github.com/dedis/drand/core	600.043s
...
*** Test killed with quit: ran too long (10m0s).
FAIL	github.com/dedis/drand/dkg	600.037s
ok  	github.com/dedis/drand/ecies	(cached)
ok  	github.com/dedis/drand/fs	(cached)
ok  	github.com/dedis/drand/key	(cached)
ok  	github.com/dedis/drand/net	(cached)
?   	github.com/dedis/drand/protobuf/control	[no test files]
?   	github.com/dedis/drand/protobuf/crypto	[no test files]
?   	github.com/dedis/drand/protobuf/crypto/share	[no test files]
?   	github.com/dedis/drand/protobuf/crypto/share/vss	[no test files]
?   	github.com/dedis/drand/protobuf/dkg	[no test files]
?   	github.com/dedis/drand/protobuf/drand	[no test files]
?   	github.com/dedis/drand/test	[no test files]

[nikkolasg]

Thanks for your contributions ! It's surely my fault, I'm working on another branch of drand and have been updating the group_info branch on github as well, without thinking of compatbility with the drand's master branch.
I'll try have a look later in the week to your branch. Timeouts should not occur locally though, but it happens that they occur in Travis, since they use a very power-limited VM and time plays a much higher factor in this context.

[gabbifish]

Hey @nikkolasg! The timeouts are happening locally, so it looks like there is an incompatibility between the latest commit on dedis/kyber's group_info branch and the way drand calls/uses functions from this library. The github.com/dedis/drand/core test timeout seems linked to the following error, which precedes the timeouts:

dkg: 127.0.0.1:46229 sending deal to 127.0.0.1:45803
grpc-client: attempting connection to 127.0.0.1:45803 (TLS true)
dkg: 127.0.0.1:45803 processing deal from 127.0.0.1:46229 (1 processed)
dkg: error processing deal: schnorr: signature of invalid length 0 instead of 161

I'm still looking into what is potentially causing the github.com/dedis/drand/dkg timeout.

[nikkolasg]

Hey @gabbifish , sorry for the lack of active responses, I started a new job recently and it's hard to keep both activities going on in parallel.

I have changed the DKG code so it compiles at least on master, and I am looking at the DKG timeout this afternoon. Will let you know of any progress as soon as I have something :)

Thanks for looking into drand !

[nikkolasg]

Hey I've found the culprits, I'm doing a PR on master to at least get a stable master version.
#72

[nikkolasg]

It's merged :) Let me know if you experience further issues with it ?

Just to let you know of the current context: There are two big features coming in the pipeline at the moment which are being close to completion (but ** not yet** !!):

• Upgraded better CLI, something that will look like New command-line interface #66
• Resharing protocol to be able to issue new shares to new group members very easily. The effect is that we'll be able afterwards to add new nodes to an already running drand group without changing the corresponding public key :)

[gabbifish]

These changes were rolled into #72, closing out issue #70